Gaya APA

Varberg, D., Purcell, E, J. (1992). Calculus : with analytic geometry (6th ed). Englewood Cliffs, NJ: Prentice Hall.

Gaya MLA

Varberg, Dale., Purcell, Edwin, J.. "Calculus : with analytic geometry". 6th ed Englewood Cliffs, NJ: Prentice Hall, 1992. Text.